Alaska Volcano Observatory - Age of formation of Kaguyak Caldera, eastern Aleutian Arc, Alaska, estimated by tephrochronology

AGE OF FORMATION OF KAGUYAK CALDERA, EASTERN ALEUTIAN ARC, ALASKA, ESTIMATED BY TEPHROCHRONOLOGY

Riehle, J. R., Waitt, R. B., Meyer, C. E., and Calk, L. C., 1998, Age of formation of Kaguyak Caldera, eastern Aleutian Arc, Alaska, estimated by tephrochronology: in Gray, J. E. and Riehle, J. R., (eds.), Geologic studies in Alaska by the U.S. Geological Survey, 1996, U.S. Geological Survey Professional Paper PP 1595, p. 161-168.

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DATA TABLES *Not all tables in a publication may be listed. Not all tables from a publication have data entered in the database.

2751: Major-element analyses of glass separates from representative reference samples of Kaguyak Crater (Site 1) and Augustine Volcano (33D)

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2761: Values of similarity coefficients sc for the glass composition of each Kaguyak-like sample compared with that of every other sample.

* From table caption: "Perfectly identical compositions would have an sc of 1.00. Only values > or equal to 0.95 are listed because smaller values do not support correlation as the same deposit. The high values here serve to (1) distinguish the samples in the data set from other Holocene samples in the region (J.R. Riehle, unpub. Data), and (2) permit correlation of each sample in the data set with nearly every other sample. Mafic-phenocryst proportions (fig. 4) provide an additional basis for comparing these highly similar samples; underlined values are sample pairs that have similar phenocryst proportions. Note that Kaguyak reference samples re indistinguishable in both glass composition and phenocryst content from some Augustine reference samples. Ilmenite compositions have been used to distinguish between these sources." *

SAMPLES

75-A
7-D
7-C
6-F
6-C
5-J
5-I
5-G
4-D
4-B
33-D
33-B
3-B
2-C
1

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